Littorina planaxis- gray littorine, columella flattened by dissolution in advanced growth whorl. Littorina scutulata- checked littorine, smaller, greenish-gray, white bands or specks, columella not flat. Melampus olivaceus, pear shaped, tide flats Lunatia heros, large, Atlantic coast Natica duplicata, small Atlantic coast Polynices lewisii- large ridged moonshell ((now Lunatia)) Polynices recluzianus- southern moonshell, thick umbilical enamel ((now Lunatia)) Natica clausa-closed natica Norrisia norrisi- smooth, brown naticoid, green umbilicus. Pomaulax undosa- Wavy top shell ((now Astraea)) Phasianella compta ? small pheasant shell Vermetus lituellus- ill shaped, flattened cone, not colonial, rough 1/8 in. ((Spiroglyphus)) Vermetus squamigerus-scaly wormshell ((Serpulorbis)) Acmaea spectrum- ribbed limpet Acmaea patina-plate limpet, nearly smooth, very fine striae Acmaea pelta -shield limpet blunt ribs, high, conical, gray or striped, internal brown stripe(marginal) and brown central spot often Acmaea asmi- black limpet, black, conical, 1/4 in. long Acmaea persona-mask limpet, apex near terminal ((drawing)), ribs prominent, irregular, outside gray or mottled, inside varying brown and white. Acmaea scabra- file limpet, fine, file-like riblets, variable light to dark, usually white inside Acmaea mitra -White cap, white conical, thick Acmaea insessa-sea-weed limpet, small dark brown, horny, high peaked ((drawing)) Acmaea instabilis - 3/4 in. , narrower than incessa, smooth, brown out and white in. Acmaea depicta - painted limpet, narrow, flat sides straight, white with brown radiating lines, 6-12 mm, southern, on grass at high tide. Acmaea paleacea - chaffy limpet, small, like last but narrower, brown no stripes. Has a var. triangularis. Lottia gigantea- Owl limpet, low, apex terminal, largest on coast Fissurella volcano- volcano limpet, striped with reddish Fissuridea aspera- rough, conical, puncture oval, not narrow as in volcano, ribbed, gray with dark purple rays ((Diodora)) Fissuridea murina- white keyhole limpet. Smaller, more delicate, oblong, round hole 1/3 from end, fine ribs checked concentrically, pure white 15 mm ((Diodora)) Luscapina crenulata- great keyhole limpet. Largest American species ((Megathura)) Lucapinella callomarginata-Southern keyhole limpet. Small, low, large oblong hole, rough rays, white interior, gray or dark rayed exterior.
